I use Winamp, the last version is compatible with MTP DAP and can put the .ogg files to the YP-U3 and the U3 can read the tags of .ogg files

Thanks for the advice. I got the latest free download and Winamp does seem quite neat. However I still can't read .ogg tags on the player, so I don't know how they work for you? My tags work in other apps . Edit: At least Winamp keeps the folders unlike SMS.